Hydraulic lubricating gun



V. P. GOERLAND HYDRAULIC LUBRICATING GUN July 26, 1932.

Filed Deo. 20, 1929 INVENTOR: www@ 'a gewag@ wM/f 71- @DJM/WW BVI ATTORNEY Patented July 26, 1932 UNITED STATES VILMUTH 1P. GOERLAN D, OF LAWSON, MICHIGAN HYDRAULIC LUBRICATING GUN Application led December 20, 1929. Serial No. 415,599.

This invention relates to improvements in hydraulic lubricating guns.

For ordinary lubrication purposes it is dcsirable to have a relatively large quantity of 5 grease fed at a relatively low pressure, and the usual type of gun is constructed to carry out this object. However, when unusual resistance is o'lered such as a stoppage in a lubrication iitting, the ordinary type of gun will be unable to create sufficient pressure to overcome this obstacle. If lubricating guns were constructed to operate only at a high pressure, the quantity of grease fed by each movement of the operating lever or screw would be materially diminished and considerably more manual labor would be necessary to force out a suflicient amount of grease to provide proper lubrication.

It is therefore one of the objects of this invention to provide an improved hydraulic lubricating gun, normally feeding grease at low pressure, in which novel means is provided, responsive to resistance oi'ered at the outlet, for ordinarily increasing the pressure of the grease discharged to a suicient degree to overcome said resistance.

A further object of this invention is to provide an improved hydraulic lubricating gun, which, under normal conditions, initially genao crates a high pressure, said high pressure being reduced to a low pressure before the grease is discharged, and which under abnormal conditions, such as when resistance is offered at the. outlet, discharges grease at the initially created high pressure unreduced.

A further object of this invention is to provide a novel construction as above described, which may be applied to a gun of the push lever type.

A further object of this invention is to provide a lubricating gun which is constructed to effectively prevent leakage of grease to the exterior of the gun casing.

A further object of this invention is to provide an improved hydraulic lubricating gun in which the grease in the discharge passageways is always under pressure and in which forced feed reloading of the passageways is automatically accomplished.

A further object of this invention is to provide an improved lubricating gun which is relatively simple in operation, strong and durable, and well adapted for the purpose described. I

In the accompanying drawing illustrating one complete embodiment of the preferred form of the invention, the ifrure is a longitudinal sectional view through the gun showing the relative position of the various parts o0 when the valves are in neutral position.

Referrin more particularly to the drawing. the re erence character I designates the main cylinder in which a piston 15 is movable. Said piston 15 has a eylindricalstcmex- II tending therefrom and movable in a cylinder H which is of considerably smaller diameter than the cylinder I. A coiled spring 14 which surrounds the inner end of the stem 13 forms a yielding seat for the piston 15. A yielding valve member 2O controls a duct between the interior of the stem 13 and the cylinder I and said valve is normally held in closed position. The cylinder I has its outer end closed' by a threaded cap 28 and said cap is provided 15 with an interior sealing cup washer 27.

A duct K leads from the cylinder I, near the outer end thereof, to a chamber E near the other end of the gun. An intermediate duct M connects the duct K with a small cyl- 30 inder B. A piston 4 which is movable within the cylinder B, against the tension of a coiled spring 5, is operated by an exterior lever 1, rearward movement being limited by a stop 2.

A timing valve 6 operable against the ten- 85 sion of a coiled spring 7 within the chamber E extends into the cylinder B and said valve is provided at its outer end with an interior perforation C communicating with a peripheral groove D. The groove is adapted to be brought into and out of registration with a duct F leading from the cylinder B to the cylinder H, and also, during certain conditions of opera-tion, with a duct G which leads to an outlet 12, there being a ball check valve between the end of the duct G and the outlet.

A groove L surrounding the piston 4 coinmunicates by way of a duct A with the space behind the piston 15 in the cylinder I. u

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In normal operation, the cylinder I, ducts K, M, F and G, chamber E and cylinders B and H are filled with a hydraulic medium, and pressure upon the lever 1 will cause movement of the plunger 4 away from the stop 2 and closing of the duct M The ressure ofthe medium in cylinder B, which or illustrative purposes we will assume to be three thousand pounds per square inch, will force the timing valve 6 against the tension of the spring 7 to a position in which the groove D registers with the duct F. This will permit passage of the medium through the perforations C to the Groove I) and duct F into the.-

c linder I-I. ssuming that the cross sectlonal area of I-I is one-tenth of a square inch and that the cross sectional area of I is one square inch, the force applied on the stem 13 and through the spring 14 onto the piston 15 will be equal to the pressure in H times the area thereof or three hundred pounds to create a diminished pressure in the cylinder I of three hundred pounds per square inch. The medium contained in the e linder I will therefore be forced in relatlvely large quantities at this reduced pressure out through the duct K, into the chamber E and through the open valve into the outlet duct G.

If resistance is offered in the fitting which this low pressure is unable to overcome the medium will not flow from the cylinder I but will allow the spring 14 between the-piston 15 and the stern 13 to be compressed. As soon as no further medium can be received by the cylinder H, the resistance in cylinder B upon moving the piston 4 further will force the timing valve 6 still further against the tension of the spring 7 until the groove D communicates directly with the duct G, causing the grease at high pressure to be short circuited directly to the outlet.

Upon release of pressure on the lever 1, the piston 4 actuated by the spring 5 will return to the position shown in the figure. rIhis will cause a release of the pressure on the timing valve 6 and said valve, due to the action of the spring 7, will open and close the duct F leaving the pressure condition in said duct and in the cylinder II unchanged. 'Ihe closing movement of piston 4 will create a vacuum in the cylinder B which upon eX- posure of the duct M will be immediately lled by the hydraulic medium under the pressure in cylinder I. After high pressure feeding, when the resistance is removed, the spring 14, which was compressed when the resistance was originally encountered, will force the piston 15 into the cylinder I slightly further to its normal position on the stem 13 thereby causing an additional amount of grease to flow through duct K to insure a forced feed reloading.

Inasmuch as said movement of the piston creates a vacuum behind it, it is desirable to to the combination.

weaver have a relief therefor. Accordingly the groove L and duct A have been provided. Any part of the medium which might escape between the piston 4 and the cylinder B, will flow through the groove L and duct A to the space behind the piston.

After the piston 15, upon completion of its stroke toward the cap Q8 and sealing cup washer 27, has exhausted the supply of hydraulic medium in the cylinder I, the valve 20, making contact on the cap 28 and washer 27, will open and admit any further medium supplied to the c linder H directly into the cylinder I, there y preventing any damage During the reloading operation of the cylinder I, which is accomplished by removal of the cap 28, the valve 20 is pressed inwardly to facilitate return of the piston I to the position shown in the figure. This will also permit an amount of lubricant in the cylinder H equal to the dislacpment of the stem 13 to enter the cylin- From the above description it may be readily seen that the object of the invention is eifectively accomplished by initially generating high pressure which is reduced to a low pressure during normal operating conditions, a quantity of grease being caused to flow which is inversely proportional to the pressure, and that during abnormal operation the originally created high pressure' is utilized directly. It may also be seen that a construction has been provided in which there is no possibility of leakage of grease to the exterior.

Althou h the invention is primarily adapted or use in connection with a lubricating gun'as shown, the basic features of the invention may be utilized very eifectively in connection with any other hydraulically operated devices where it is desirable to first obtain a rapid movement with low pressure and then when resistance is oifered to utilize a high pressure. It is therefore to be understood that any adaptations such as above mentioned, and any changes or modifications are contemplated as may come within the scope of the claims.

What I claim is:

1. In a hydraulic device having means for receiving a hydraulic medium, means for initially displacing a portion of said medium at high pressure, means for utilizing the medium at said pressure to create a reduced pressure on another portion of the medium, means for directing said medium at reduced pressure to a point of utilization, and means for directly leading the portion of the medium at high pressure to said point of utilization when resistance is offered to displacement of the portion of the medium at said reduced pressure.

2. In a hydraulic device having means for receiving a hydraulic medium, means for initially displacing a portion of said medium at high pressure, means for utilizing the medium at said pressure to create a reduced pressure on another portion of the medium, means for directing said medium at reduced pressure to a point of utilization, and means for automatically shunting the portion of the medium at high pressure to said point of utilization when resistance is offered to displacement of the portion of the medium at said reduced pressure.

3. In a hydraulic device having means for receiving a hydraulic medium, a piston for initially displacing a portion of said medium to create a high pressure thereon, a second piston of larger diameter than said first piston movable by said medium originally displaced to create in another portion of the hydraulic medium a reduced pressure, means for directing said medium at the reduced pressure to a point of utilization, and means for directly leading said portion of the medium at high pressure to said point of utilization when resistance is offered to displacement of the portion of the medium at reduced pressure.

4. In a hydraulic device having a cylinder to which a hydraulic medium may be admitted, means for creating pressure on the medium in said cylinder, a second cylinder, means for automatically admitting said medium to said second cylinder when a high pressure has been created in -said first cylinder, a third cylinder of larger diameter than said first two cylinders and also having a hydraulic medium therein, a piston movable in said third cylinder and actuated by the movement of the medium in the second cylinder to create a reduced pressure on said medium in the third cylinder, means for directing said medium in the third cylinder to a point of utilization, and means for directly leading the portion of the medium at high pressure to said point of utilization when resistance is oii'ered to displacement of the portion of the medium at low pressure in the third cylinder.

5. In a hydraulic device having a cylinder to which a hydraulic medium may be admitted, means for creating pressure on the medium in said cylinder, a second cylinder, yielding valve means for automatically admitting said medium to said second cylinder when a high pressure has been created in said first cylinder, a third cylinder of larger diameter than said first two cylinders and also having a hydraulic medium therein, a piston movable in said third cylinder and actuated by the movement of the medium in the second cylinder to create a reduced pressure on said medium in the third cylinder, means for directing said medium in the third cylinder to a pointv of utilization, and means for directly leading the portion of the medium at high pressure to said point of utilization when resistance is offered to displacement of the portion of the medium at low pressure in the third cylinder.

6. In a hydraulic device having a cylinder to which a hydraulic medium may be admitted, means for creating pressure on Athe medium in said cylinder, a second cylinder, means for automatically admitting said medium to said second cylinder when a high pressure has been created in said first cylinder, a third cylinder of larger diameter than said first two cylinders and also having a hydraulic medium therein, a piston movable in said third cylinder and actuated by the movement of the medium in the second cylinder to create a reduced pressure on said medium in the third cylinder, means for directing said medium in the third cylinder, to a point of utilization, and automatic valve means for short circuiting the portion of the medium at high pressure to said point of utilization when resistance is offered to displacement of the medium at low pressure in the third cylinder.

7. In a hydraulic device having a cylinder to which a hydraulic medium may be admitted, means for creating pressure on the medium in said cylinder, a second cylinder, means for automatically admitting said medium to said second cylinder, when a high pressure has been created in said first cylinder, a third cylinder of larger diameter than said first two cylinders and also having a hydraulic medium therein, a piston movable in said third cylinder and actuated by the movement of the medium in the second cylinder to create a reduced pressure on said medium in the third cylinder, means for directing said medium in the third cylinder to a point of utilization, and means for directly leading the portion of the medium at high pressure to said point of utilization when resistance is offered to displacement of the portion of the medium at low pressure in the third cylinder, there being a relief passageway connecting the first cylinder with the third cylinder behind the piston therein.

8. In a hydraulic device having a cylinder to which a hydraulic medium may be admitted, means for creating pressure on the medium in said cylinder, a second cylinder, means for automatically admitting said medium to said second cylinder when a high pressure has been created in said first cylinder, a third cylinder of larger diameter than said first two cylinders and also having a hydraulic medium therein, a piston movable in said third cylinder and actuated by the movement of the medium in the second cylinder to creat a reduced pressure on said medium in the third cylinder, means for directing said medium in the third cylinder to a point of utilization, means for directly leading the portion of the medium at high pressure to said point of utilization when resistance is odered to displacement of the portion of the medium at lon7 pressure in the third cylinder, said piston in the third cylinder having an opening extending therethrough, and a valve controlling said opening and automatically operable When the piston has reached the end of its stroke.

9. In a hydraulic device having a cylinder to which a hydraulic medium may be admitted, means for creating pressure on the medium in said cylinder, a second cylinder, means for automatically admitting said medium to said second cylinder When a high pressure has been created in said first cylinder, a third cylinder of larger diameter than said first tWo cylinders and also having a hydraulic medium therein, a piston movable in said third cylinder and actuated by the movement of the medium in the second cylinder to create a reduced pressure on said medium in the third cylinder, means for directing said medium in the third cylinder to a point of utilization, means for directly leading the portion of the medium at high pressure to said point of utilization when resistance is offered to displacement of the portion of the medium at low pressure in the third cylinder, said piston in the third cylinder having an opening extending therethrough, and a valve controlling said opening to provide for passage of medium from the second cylinder to the third cylinder when the piston is pushed back preparatory to reloading.

l0. In a hydraulic device having a cylinder to which a hydraulic medium may be admitted, means for creating pressure on the medium in said cylinder, a second cylinder, means for automatically admitting said medium to said second cylinder When a high pressure has been created in said first cylinder, a third cylinder of larger diameter than said first two cylinders and also having a hydraulic medium therein, a piston movable in said third cylinder and actuated by the movement of the medium in the second cylinder to create a reduced'pressure on said medium in the third cylinder, means for directing said medium in the third cylinder to a point of utilization, a cylindrical stem movable in the second cylinder on which the piston is mounted, and means for directly leading the portion of the medium at high pressure to said point of utilization when resistance is offered to displacement of the portion of the medium at low pressure in the third cylinder.

1l. In a hydraulic device having a cylinder to which a hydraulic medium may be admitted, means for creating pressure on the medium in said cylinder, a second cylinder, means for automatically admitting said medium to said second cylinder when a high pressure has been created in said first cylinder, a third cylinder of larger diameter than said first two cylinders and also havin a hydraulic medium therein, a pistonmova le Laea'roi in said third cylinder and actuated by the movement of the medium in the second cylinder to creat a reduced pressure on said medium in the third cylinder, means for directing said medium in the third cylinder to a point of utilization, a cylindrical stem movable in the second cylinder on which the piston is yieldingly mounted, and means for directly leading the portion of the medium at high pressure to said point of utilization when resistance is offered to displacement of the portion of the medium at low pressure in the third cylinder.

12. In a hydraulic device having a cylinder for a hydraulic medium, a piston operable by a primary force for creating pressure on the medium in said cylinder, there being an outlet duct extending from said first cylinder, a second cylinder, there being a duct connecting the first cylinder with said second cylinder, a yielding valve in said first cylinder acting to normally provide passage of medium at high pressure to the second cylinder, a third cylinder of larger diameter than the first cylinder and also having a hydraulic medium therein, a piston movable in said third cylinder and actuated by movement of the medium in the second cylinder t0 create a 'reduced pressure on said medium in the third cylinder, there being a main duct extending from the third cylinder and there being a branch feeding duct controlled by the manual piston connecting said main duct with the first cylinder and an outlet branch duct connecting said main duct with the outlet duct, the yielding valve in the first cylinder when in the normal operating position to admit medium from the first cylinder to the second cylinder also admitting medium at low pressure from the main duct and outlet branch duct to the outlet duct, and said yielding valve being responsive to resistance at the outlet to admit medium at high pressure to lhe outlet duct directly' from the first cylin- 1.3. A hydraulic lubricating gun having cylinders for receiving a lubricating mei dium and having an outlet for connection with a lubrication fitting, comprising means for initially displacing a portion of said medium at high pressure,'means for utilizing the medium at said pressure to create a reduced pressure on another portion of the medium, said portion of the medium at reduced pressure being discharged at the outlet during normal operating conditions, and means for directly discharging the portion of the medium at high pressure through said outlet when resistance is offered to passage therethrough of the portion of the medium at low pressure.

14. A hydraulic lubricating gun having cylinders for receiving a lubricating medium and having an outlet for connection with a lubrication'litting, comprising means for initially displacing a portion of said medium at high pressure, means for utilizing the medium at said pressure to create a reduced pressure on another portion of the medium, said ortion of the medium at reduced pressure eing discharged at the outlet during normal operating conditions, and means for automatically discharging the portion of the medium at high pressure directly through said outlet when resistance lis offered to passage therethrough of the portion of the medium at low pressure.

15. A hydraulic lubricating gun having means for receiving a lubricating medium and having an outlet for connection with a lubrication fitting, comprising a piston for initially displacing a portion of said medium to create a high pressure thereon, a second piston of larger diameter than said first piston movable by said medum originally displaced to create in another portion of the hydraulic mediuma reduced pressure, said medium at reduced pressure being discharged at the outlet during normal operating conditions, and means for directly discharging a portion of the medium at high pressure through said outlet when resistance is oli'ered to passage therethrough of the portion of the medium at low pressure.

16. A hydraulic lubricating gun having an outlet for connection with a lubrication fitting, comprising a cylinder to which a lub'ricating medium may be admitted, means for creating pressure on the medium in said cylinder, a second cylinder, means for automatically admitting said medium to said second cylinder when a high pressure has been created in said first cylinder, a third cylinder of larger diameter than said first two cylinders and also having a. lubricating medium therein, a piston movable in said third cylinder and actuated by the movement of the medium in the second cylinder to create a reduced presf`A sure on said medium in the third cylinder, said medium in the third cylinder being discharged at the outlet during normal operating conditions, and means for causing direct discharge of the portion of the medium athigh pressure through said outlet when resistance is offered to passage therethrough of the portion of the medium at low pressure.

17. A hydraulic lubricating gun having an outlet for connection with a lubrication litting, comprising a cylinder to which a lubricating medium may be admitted, means for creating pressure on the medium in said cylinder, a second cylinder. yielding valve means for automatically admitting said medium to said second cylinder when a high pressure has been created in said first cylinder, a third cylinder of larger diameter than said first two cylinders and also having a lubricating medium therein, a piston movable in said third cylinder and actuated by the movement of the medium in the second cylinder to create a reduced pressure on said medium in the third cylinder, said medium in the third cylinder being discharged at the outlet during normal operating conditions, and means for causing direct discharge of the portion of the medium at high pressure through said outlet when resistance is offered to passage therethrough of the portion of the medium at low pressure.

18. A hydraulic lubricating gun having an outlet for connection with a lubrication fitting, comprising a'cylinder to which a lubricating medium may be admitted, means for creating pressure on the medium in said cylinder, a second cylinder, means for automatically admitting said medium to said second cylinder when a high pressure has been created in said first cylinder, a third cylinder of larger diameter than said first two cylinders and also having a lubricating medium therein, al piston movable in said third cylinder and actuated by the movement of the medium in the second cylinder to create a reduced pressure on said medium in the third cylinder, said medium in the thirdcylinder being discharged at the outlet during normal operating conditions, and automatic valve means for short-circuiting the portion of the medium at high pressure to cause discharge of the same directly through the outlet when resistance is offered to passage therethrough of the portion of the medium at low pressure.

19. A hydraulic lubricating gun having an outlet for connection with a lubrication fitting, comprising a cylinder to which a lubricating medium may be admitted, means for creating pressure on the medium in said cylinder, a second cylinder, means for automatically admitting said medium to said second cylinder when a high pressure has been created in said first cylinder, a third cylinder of larger diameter than said first two cylinders and also having a lubricating medium therein, a piston movable in said third cylinder and actuated by the movement of the medium in the second cylinder to create a reduced pressure on said medium in the third cylinder, said medium in the third cylinder, being discharged at the outlet during normal operating conditions, and means for causing direct discharge of the portion of the medium at high pressure through said outlet when resistance is offered to passage therethrough of the portion of the medium at low pressure, there being a relief passageway connecting the first cylinder with the third cylinder behind the piston therein.

20. A hydraulic lubricating gun having an outlet for connection with a lubrication tting, comprising a cylinder to which a lubricating medium may be admitted, means for creating pressure on the medium in said cylinder, a second cylinder, means for automatically admitting said medium to said second cylinder when a high pressure has been created in said iirst cylinder, a third cylinder of larger diameter than said first tvvo cylinders and also having a lubricating medium therein, a piston movable in said third c linder and actuated by the movement ot the medium in the second cylinder to create a reduced pressure on said medium in the .third cylinder, said medium in the third cylinder being discharged at the outlet during normal operating conditions, means for causing d1- rect discharge of the portion of the medium at high pressure through said outlet when resistance is oiiered to passage therethrough of the portion of the medium at lou1 pressure, said piston in the third cylinder having an opening extending therethrough, and a valve controlling said opening and automatlcally operable when the piston has reached the end ot its stroke.

21. A hydraulic lubricating gun having an outlet for connection with a lubrication fitting, comprising a cylinder to which a lubrieating medium may be admitted, means Jfor creating pressure on the medium in said cylinder, a second cylinder, means for automatically admitting said medium to said second cylinder when a high pressure has been created in said first cylinder, a third cylinder of larger diameter than said first two cylinders and also having a lubricating medium therein, a piston movable in said third cylinder and actuated by the movement of the medium in the second cylinder to create a reduced pressure on said medium in the third cylinder, said medium in the third cylinder being discharged at the outlet during normal operating conditions, means for causing direct discharge of the portion of the medium at high pressure through said outlet When resistance is offered to passage therethrough of the portion of the medium at low pressure, said piston in the third cylinder having an opening extending therethrough, and a valve controlling said opening to provide for passage of medium from the second cylinder to the third cylinder when the piston is pushed back preparatory to reloading.

22. A hydraulic lubricating gun having an outlet for connection with a lubrication fitting, comprising a cylinder to which a lubricating medium may be admitted, means for creating pressure on the medium in said cylinder, a second cylinder, means for automatically admitting said medium to said second cylinder When a high pressure is created in said irst cylinder, a third cylinder of larger diameter than said first tivo cylinders and also having a hydraulic medium therein. a'piston movable in said third cylinder and actuated by movement of the medium in the second cylinder to create a reduced pressure on said medium in the third cylinder, said medium in the third cylinder being discharged through the outlet, a cylindrical stem movable in the second cylinder on which the piston is mounted, and means for causing aacaaci direct discharge of the portion of the medium at high pressure through the outlet When resistance is offered to passage therethrough of the portion ofthe medium at low pressure.

23. A hydraulic lubricating gun having an outlet for connection with a lubrication fitting, comprising a cylinder to which a lubricating medium may be admitted, means for creating pressure on the medium in said cylinder, a second cylinder, means for automatically admitting said medium to said second cylinder when a high pressure is created in said first cylinder, a third cylinder of larger diameter than said first two cylinders and also having a hydraulic medium therein, a piston movable in said third cylinder and actuated by movement ot the medium in the second cylinder to create a reduced pressure on said medium in the third cylinder, said medium in the third cylinder being discharged through the outlet, a cylindrical stem movable in the second cylinder on which the piston is yieldingly mounted, and means for causing direct discharge of the portion of the medium at high pressure through the outlet when resistance is oiered to passage therethrough of the portion of the medium at low pressure.

24. A hydraulic lubricating gun, comprising a cylinder for a lubricating medium, a manually operable piston for creating prcssure on the medium in said cylinder, there being an outlet duct extending from said first cylinder, a second cylinder, there being a duct connecting the first cylinder with the second cylinder, a yielding valve in said first cylinder acting to normally provide passage of medium at high pressure` to the second cylinder, a third cylinder of larger diameter than the first cylinder and also having a lubricating medium therein, a piston movable in said third cylinder and actuated by movement of the medium in the second cylinder to create a reduced pressure on said medium in the third cylinder, there being a main duct extending from the third cylinder and there being a branch feeding duct controlled by the manual piston connecting said main duct with the first cylinder and there being an outlet branch duct connecting said main duct with the outlet duct, the yielding valve in the first cylinder when in normal operating position to admit medium from the first cylinder to the second cylinder also admitting medium at low pressure from the main duct and outlet branch duct to the outlet duct, and said yielding valve being responsive to resistance at the outlet to admit lubrieating medium at high pressure to the outlet duct directly from the first cylinder.

VILMUTH P. GOERLAND. 

